insane prices!
explains a little micron and other semi stocks on a major bull run last 2 months ...
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MP 7,1 Which LRDIMM 2933 64GB RAM for 2019 Mac Pro - Samsung vs Micron vs Hynix?
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insane prices!
explains a little micron and other semi stocks on a major bull run last 2 months ...
I tested the 32GB of memory in my MP7,1 with the new , faster USB thumb drive . It ran again in single user mode .
The new drive is a NVMe USB SSD made with a HP EX 920 M.2 and gets around 740 MB/s bandwidth and much higher IOPS than the cheap $5 USB thumb drive I used before .
It only took 4 hours to complete the standard test with the NVMe USB SSD , as opposed to 10 hours with the cheap $5 USB drive . I didn't get the super fast speed I was hoping for , but it did run quicker .
I couldn't help to notice the coders at PassMark need a spelling checker . They misspelled the word "errors" . You can't make this up ...
The new drive is a NVMe USB SSD made with a HP EX 920 M.2 and gets around 740 MB/s bandwidth and much higher IOPS than the cheap $5 USB thumb drive I used before .
It only took 4 hours to complete the standard test with the NVMe USB SSD , as opposed to 10 hours with the cheap $5 USB drive . I didn't get the super fast speed I was hoping for , but it did run quicker .
I couldn't help to notice the coders at PassMark need a spelling checker . They misspelled the word "errors" . You can't make this up ...
Supermicro now has 3200 MHz DDR4 memory in stock . Max capacity is 32 GB , for now .
Supermicro 32GB 288-Pin DDR4 3200 (PC4-25600) Server Memory (MEM-DR432L-CL03-ER32) for $170 each .
store.supermicro.com
I don't think they'll qualify it for a Mac , though 😄
Supermicro 32GB 288-Pin DDR4 3200 (PC4-25600) Server Memory (MEM-DR432L-CL03-ER32) for $170 each .
Micron 32GB DDR4 3200 MEM-DR432L-CL03-ER32 Server Memory
Shop Micron (MTA36ASF4G72PZ-3G2E7) certified and validated 32GB 288-Pin DDR4 ECC registered Cas Latency 22 server memory and other server memory products
I don't think they'll qualify it for a Mac , though 😄
I have a thought . Why not install Windows 10 in your MP7,1 and then run the Windows version of Memtest on the whole configuration ? It shouldn't matter what OS is used , only that the modules are verified to be good .
The only wildcard is exactly how long the test would take .
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That's true and running the single user command line version of a memory test will produce more accurate results . And that might be the way Memtest for Mac will run with modern Systems .
In the old days , I used to do precisely that but discovered it would not permit , of course , me to perform a System load test ( where all major components are placed under concurrent and continuous loads . Sort of a Super Test to shake out any defects in a Build .
But we're still back to the wildcard ... How long will the test take to completion ? The OP needs his Mac for production reasons .
Not just to run tests all day for the MacRumorati
Can Memtest86 run in the background while Mac Pro is being used or have to let it run straight for days?
It can run in a macOS session , but it will not test anywhere near the entire capacity of the memory installed . I don't recall looping memtest in this fashion . I can loop the test after booting the program into an unix environment from an USB drive .
I have not experienced any issues with my Mac Pro since going full production with what I do. Have at one point used nearly 60% of the 768G RAM (according to Sensei app) . Since the only down time for my is the weekend, I am not sure that is enough time to test the 768G fully.
Any suggestions? Thanks!
Well , you can run memtest86 from a bootable USB drive and run the test on your entire 768 GB configuration , with just one pass . The default is four passes .
Since it took me an average of one hour to test each 8GB of memory capacity four times , I would say that to test 768GB of memory with one pass would take 24 continuous hours for you . I had a 8 Core ( I have since upgraded to 28 cores ) System and used a fast USB NVMe M.2 SSD to boot memtest with . That might very well make a difference .
OK, i am curious to know. I too have a 28 core and Apple's 8TB SSD. I will look into running with some external stick. Probably use an old Samsung T2 SSD.
Did the Mac Pro fan went noisy while you tested yours?
Finished a memory test, took 26+ hours using TechTool Pro 11 app
ran benchmarks afterwards
posted all info here in this thread:
forums.macrumors.com
ran benchmarks afterwards
posted all info here in this thread:
2019 Mac Pro GeekBench 5 Benchmarks - Metal - Open Cl - Memory Test timing
Got my 7,1 Mac Pro Jan 10, so over 2 weeks of heavy use. Got my Pro Display XDR Jan 21 1. Memory test on 768GB RAM (12 x 64GB) M386A8K40CM2-CVF purchased from Memory.net A) the Apple hardware system test (restart with D pressed) ran for about 5 minutes saying that there are no issues. B)...
forums.macrumors.com
I have no memory of it , therefore it was quiet
It was quiet for me too over the 26+ hours. The Apple hardware test which took 3 minutes had the fans at max and the wind out in front was impressive.
Yeah, the Apple diagnostic tests sucked. No issues after blowing air for 3 minutes does not give comfort to most of us who invested ten of thousands on our Mac Pros. The TechTool Pro 11 was a little better but I wished they have more details on their tests as well.
During the 26 hours, I did do an emergency Outlook email read, not sure if that corrupted the ongoing RAM tests.
The Apple Diagnostics test is surprisingly complex and fast . I looked up all the possible error codes and , my goodness , it was long .
Apple Diagnostics reference codes - Apple Support
Get more information about the reference codes shown in Apple Diagnostics test results.
If the OS is running, memory tests are suspect. Boot from a USB thumb drive, using a standalone memory test.
Could not boot from the thumb drive, something regarding security. Have not looked further into that.
Have you tried? Steps to bypass the security?
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The Apple Diagnostics test is surprisingly complex and fast . I looked up all the possible error codes and , my goodness , it was long .
Apple Diagnostics reference codes - Apple Support
Get more information about the reference codes shown in Apple Diagnostics test results.support.apple.com
Right, but at 3 minutes, how possibly can it test all the RAM?
You should have no problem . Go into Startup Security Utility . Select "No Security" for Secure Boot and "Allow Booting from external media" for External Boot . For good measure , I also disable SIP .
About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support
Use Startup Security Utility to make sure that your Mac always starts up from your designated startup disk, and always from a legitimate, trusted operating system.
It doesn't ! That's why the Tech Gods invented Memtest .
You should have no problem . Go into Startup Security Utility . Select "No Security" for Secure Boot and "Allow Booting from external media" for External Boot . For good measure , I also disable SIP .
About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support
Use Startup Security Utility to make sure that your Mac always starts up from your designated startup disk, and always from a legitimate, trusted operating system.
It doesn't ! That's why the Tech Gods invented Memtest .
Is this gonna burn a hole on my Pro Display XDR screen during this long test? Should I unplug the display?
Hmm, calculating:
1.5TiB memory across six channels. That's 0.25TiB per channel. Assuming "2933" RAM. 274,877,906,944 bytes / 23,466,666,666 bytes/sec = 11.71 seconds to transfer the entire memory contents between RAM and CPU.
Lets assume a "mod3" test (which Apple used in the 68K Macs) that needs to write and read back a test pattern three times. Six times 11.71 is under 71 seconds. That leaves plenty of time for overhead and other tests in three minutes.
FYI, the mod 3 test writes and verifies three repeating patterns: %011011011011011011011011011011011011, %110110110110110110110110, and %101101101101101101101101, i.e. 0x6db6db, 0xdb6db6, and 0xb6db6d or their complements. This is good enough to detect bits stuck at zero, stuck at one, shorted to a neighbor, or a problem on the address or data bus. It does not test advanced issues like row hammer or refresh intervals.
Hey, thanks. by any chance do you have a multi core Mac Pro with the AMD Radeon Pro Vega II 32GB card?
Does a Geekbench metal score of 82,000 to 86,000 seem too low?
I followed you and ordered the same thing from memory.net, but only for 6 (384GB total). Price went up to $314 and no free shipping. Just a bit of a discount. Now memory4less is cheaper @ $299 I guess I won't be cancelling my order to save a few bucks - memory.net has a better review.
After all these tests, are you still happy with your purchase?
what difference does it make?
the memory area in which the system works cannot be checked because it is locked
Oh yes.
I run them hard for work and play for over 2 weeks now and no issues. The left side of the Mac Pro with the RAM never felt hot with all 12 slots full.
I ran several memory tests as noted elsewhere, 2 with perfect results while 2 other tests did not finish due to app failure. I may try those again next weekend.
Yes, the memory.net Samsung chips made in the Philippines are solid.
Yes, I've been following your tests. Are you concerned at all about the 2 other failed tests due to app failure?
OK.
I ran this using an external screen and got this when I woke up. No notes or error logs anywhere. May run again next weekend. Work week starts now.